Methodology of Detection and Recognition of Faults in the Unit Components

Detection and diagnosis of faults that may arise in the work process of the unit are carried out to increase the resource, reliability, and stability of its exploitation. In the article, the object of research is the detection and recognition of faults that occur in the main components of the steering unit AR20N – in the electrohydraulic amplifier (EHA) and the power cylinder (PC). The main purpose of the research is to develop a methodology for detecting and recognizing faults in the EHA and PC of the AR20N unit based on the results of measurements of the current values of the parameters of these units when various faults appear and develop. To achieve the set purpose, the following tasks were solved: using simulation modeling, the parameters of the unit model were determined, the numerical values of which contain information (diagnostic signs of the technical condition of the EHA and PC) about the appearance of various faults in the units; Shewhart diagnostic charts and the methodology of identification of current values of these parameters are developed. For this purpose, the following methods are used in the article: analytical, numerical, and statistical. The following results have been obtained: a methodology of detection, development, and recognition of faults of EHA and PC has been developed, in which hypothesis testing and determination of the probability of committing errors of the first and second type in decision-making are provided. The scientific and practical novelty of the obtained results consists in the development of a methodology for determining the diagnostic signs of the technical condition of the EHA and PC.